CuInS2 quantum dots, CuInS2/ZnS quantum dots and their preparation and application

A technology of quantum dots and compounds, which is applied in the field of CuInS2 and CuInS2-ZnS quantum dots, can solve the problems of oil-phase quantum dots and water-phase quantum dots, and achieve high-efficiency photolysis of water to produce hydrogen, simple process, and good visible light absorption properties. Effect

Inactive Publication Date: 2017-09-26
SHANGHAI TECH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] CuInS 2 and CuInS 2 -ZnS quantum dots are a class of nanomaterials with low toxicity. However, the preparation of these two kinds of quantum dots is mainly concentrated on the oil-soluble method at this stage. In this preparation method, 1-dodecanesulfuric acid is used as a ligand. Ligands and quantum dots have a strong binding ability, which makes it very difficult for oil phase quantum dots to undergo ligand exchange to obtain water phase quantum dots. However, it is used to synthesize CuInS in water phase. 2 and CuInS 2 -The method of ZnS quantum dots is rarely reported

Method used

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  • CuInS2 quantum dots, CuInS2/ZnS quantum dots and their preparation and application
  • CuInS2 quantum dots, CuInS2/ZnS quantum dots and their preparation and application
  • CuInS2 quantum dots, CuInS2/ZnS quantum dots and their preparation and application

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Experimental program
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Effect test

Embodiment 1

[0046] CuInS 2 Preparation method of quantum dots:

[0047] Weigh 85.0 mg (0.5 mmol) of copper chloride dihydrate, 586.0 mg (2.0 mmol) of indium trichloride tetrahydrate, and 5.97 g (20.0 mmol) of glutathione into a 500 mL three-necked flask containing 125 mL of deionized water , Adjust the pH to 8.5 with a 0.2M aqueous sodium hydroxide solution to obtain mixed solution A; then add sodium sulfide (0.31g, 4.0mmol) dissolved in 10mL of water to obtain mixed solution B; warm up mixed solution B to 100℃ and Stir vigorously at this temperature at 1500 rpm for 4.0 hours and then cool to room temperature; add 125 mL of ethanol to the mixture, and centrifuge to separate a black solid. After washing twice with ethanol, it is dried in a vacuum oven at 40°C to obtain orange yellow Solid, namely CuInS 2 Quantum dots. Such as figure 1 For the prepared CuInS 2 Ultraviolet-visible absorption, fluorescence spectrum and X-ray diffraction spectrum of quantum dots.

Embodiment 2

[0049] CuInS 2 / ZnS quantum dot preparation (n In : N Zn =1:0.5)

[0050] Weigh 85.0 mg (0.5 mmol) of copper chloride dihydrate, 586.0 mg (2.0 mmol) of indium trichloride tetrahydrate, and 5.97 g (20.0 mmol) of glutathione into a 500 mL three-necked flask containing 125 mL of deionized water , Adjust the pH to 8.5 with a 0.2M aqueous sodium hydroxide solution to obtain mixed solution A; then add sodium sulfide (0.31g, 4.0mmol) dissolved in 10mL of water to obtain mixed solution B; heat the resulting 135mL mixed solution B to 100°C and stirring vigorously at 1500rpm at this temperature for 4.0 hours, add 214.5mg (1.0mmol) zinc acetate dihydrate, 76.1mg (1.0mmol) thiourea and 461.0mg (1.5mmol) of glutathione. 20mL of an aqueous solution with a pH of 12.5, mixed at 100℃ and continued to stir vigorously at 1500rpm for 45 minutes, then cooled to room temperature, 200mL of ethanol was added, and a dark brown solid was obtained by centrifugation. After washing twice with ethanol, vac...

Embodiment 3

[0052] CuInS 2 / ZnS quantum dot preparation (n In : N Zn = 1:1)

[0053] Weigh 85.0 mg (0.5 mmol) of copper chloride dihydrate, 586.0 mg (2.0 mmol) of indium trichloride tetrahydrate, and 5.97 g (20.0 mmol) of glutathione into a 500 mL three-necked flask containing 125 mL of deionized water , Adjust the pH to 8.5 with a 0.2M aqueous sodium hydroxide solution to obtain mixed solution A, then add sodium sulfide (0.31g, 4.0mmol) dissolved in 10mL of water to obtain mixed solution B; heat the resulting 135mL mixed solution B to 100°C and vigorously stirred at 1500rpm at this temperature for 4.0 hours. After adding 429.0mg (2.0mmol) zinc acetate dihydrate, 152.2mg (2.0mmol) thiourea and 922.0mg (3.0mmol) glutathione 20mL of an aqueous solution with a pH of 12.5, mixed at 100℃ and continued to stir vigorously at 1500rpm for 45 minutes, then cooled to room temperature, 200mL of ethanol was added, and a dark brown solid was obtained by centrifugation. After washing twice with ethanol,...

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Abstract

The invention provides CuInS2 quantum dots, CuInS2/ZnS quantum dots and their preparation and application. A preparation method of the CuInS2 quantum dots is characterized by comprising the steps of 1, adding a copper-source compound, an indium-source compound and glutathione into water, adjusting pH to 7-10 to obtain mixed liquid A, and adding an aqueous solution containing a sulfur-source compound to obtain mixture B; 2, heating the mixture B to 70-100 DEG C, stirring at this temperature for 2-4 h, cooling, adding ethanol, centrifugally separating, and purifying to obtain the CuInS2 quantum dots. A quantum dot photocatalyst obtained herein has low toxicity, is able to produce hydrogen by water photocatalysis under zero co-catalysts, has good visible light absorption, and reaches about 10% of quantum efficiency in hydrogen production by photocatalysis at visible light band.

Description

Technical field [0001] The present invention relates to CuInS 2 And CuInS 2 -ZnS quantum dots, catalysts and photoelectrodes based on the quantum dots and their preparation. Background technique [0002] With the rapid development of human society today, with the continuous consumption of fossil fuels, we are not only facing more and more severe energy problems, but also the abnormal global ecological environment that has brought us great survival and development. Threatened. Therefore, the development of new renewable and pollution-free energy sources has become an urgent problem for scientific researchers. Among the many new energy sources, H 2 As an environmentally friendly energy source, it has been extensively studied. [0003] Since the discovery of TiO in 1972 2 Since the photoelectric catalytic hydrogen production is possible, scientific researchers have developed a large number of new materials based on the photoelectric catalytic hydrogen production direction, hoping to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/62B01J27/04B01J27/047B01J27/22B82Y20/00B82Y40/00C01B3/04C25B1/04C25B11/06
CPCB01J21/18B01J27/04B01J27/047B01J27/22B01J35/0006B01J35/004B82Y20/00B82Y40/00C01B3/042C09K11/62C25B1/04C25B1/55C25B11/075C25B11/091Y02E60/36
Inventor 宁志军刘晓院王瑞丽
Owner SHANGHAI TECH UNIV
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